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Characterization of an Ochrobactrum intermedium strain STCr-5 manifesting high level Cr(VI) resistance and reduction potential

Paper ID Volume ID Publish Year Pages File Format Full-Text
18536 42725 2006 6 PDF Available
Title
Characterization of an Ochrobactrum intermedium strain STCr-5 manifesting high level Cr(VI) resistance and reduction potential
Abstract

The investigation was conducted to evaluate the Cr(VI) resistance and reduction by a bacterial strain STCr-5 under different conditions. Strain STCr-5 tolerated very high concentration of Cr(VI) i.e., >10 mg ml−1 in nutrient broth and up to 8 mg ml−1 in M9 minimal medium. Based on 16S rRNA gene sequence homology, the isolate was identified as Ochrobactrum intermedium. It showed up to 90% reduction with different forms of Cr(VI) (CrO42−, Cr2O72−). O. intermedium STCr-5 exhibited a broad range of Cr(VI) reduction efficiencies at temperatures from 28 to 50 °C and pH levels from 6 to 8. Cr(VI) reduction capability was related to initial cell concentration and Cr(VI) concentration. O. intermedium STCr-5 demonstrated highly efficient Cr(VI) reduction over the Cr(VI) concentration range 100–1000 μg ml−1. Strain STCr-5 reduced 200 μg Cr(VI) ml−1 within 72 h and displayed 50% reduction at the highest Cr(VI) concentration of 1000 μg ml−1 within 96 h. Cr(VI) reduction ability of strain STCr-5 was not influenced by sulphate and nitrate up to 1000 μg ml−1. The presence of other metals (Cu2+, Co2+, Mn2+, Ni2+, Zn2+) significantly stimulated Cr(VI) reduction by this isolate. O. intermedium STCr-5, thus, holds great promise for detoxification of Cr(VI) under a wide range of environmental conditions.

Keywords
O. intermedium; Cr(VI) resistance; Cr(VI) reduction; Tannery waste
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Characterization of an Ochrobactrum intermedium strain STCr-5 manifesting high level Cr(VI) resistance and reduction potential
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 39, Issue 4, 2 August 2006, Pages 883–888
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us